Book Image

Android Programming for Beginners

By : John Horton, Paresh Mayani
Book Image

Android Programming for Beginners

By: John Horton, Paresh Mayani

Overview of this book

Android is the most popular OS in the world. There are millions of devices accessing tens of thousands of applications. It is many people's entry point into the world of technology; it is an operating system for everyone. Despite this, the entry-fee to actually make Android applications is usually a computer science degree, or five years’ worth of Java experience. Android Programming for Beginners will be your companion to create Android applications from scratch—whether you’re looking to start your programming career, make an application for work, be reintroduced to mobile development, or are just looking to program for fun. We will introduce you to all the fundamental concepts of programming in an Android context, from the Java basics to working with the Android API. All examples are created from within Android Studio, the official Android development environment that helps supercharge your application development process. After this crash-course, we’ll dive deeper into Android programming and you’ll learn how to create applications with a professional-standard UI through fragments, make location-aware apps with Google Maps integration, and store your user’s data with SQLite. In addition, you’ll see how to make your apps multilingual, capture images from a device’s camera, and work with graphics, sound, and animations too. By the end of this book, you’ll be ready to start building your own custom applications in Android and Java.
Table of Contents (37 chapters)
Android Programming for Beginners
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

The Animations Demo app – introducing SeekBar


That was enough theory, especially with something that should be so visible. Let's build an animation demo app that explores everything that we just discussed and a bit more.

This app involves a little amount of code in lots of different files. So, I have tried to make it plain which code is in which file, so you can keep track of what is going on. This will make the Java code that we write in this mini app more understandable as well.

The app will demonstrate rotations, fades, translations, animation events, interpolations, and controlling duration with SeekBar. The best way to explain what SeekBar does is to build it and then watch it in action.

Laying out the animation demo

Create a new project called Animation Demo, leaving all the settings at their defaults as usual.

Here is how we can lay out the UI for this app:

  1. Delete the default Hello world! widget.

  2. Add LinearLayout (vertical).

  3. Inside the layout from the previous step, place LinearLayout (vertical...